SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e85c97f5455e98eb7bb81390988a2e31bfe5c17f24c54c636b2189f792d62cd2' 
  AND token = 'YCGRTr0pR3gemglCqc7/iCA+5ZMKbTkmuGJnESwlr6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}